klips/esp/cpp/06_lcd-panel/main/main.cpp

#include <esp_lcd_io_i2c.h>
#include "driver/i2c_master.h"
#include "esp_lcd_panel_ssd1306.h"
#include "esp_lvgl_port.h"

#include "HardwareSerial.h"
#include "WiFi.h"

static const char *TAG = "lcd-panel";

// https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255
// According to SSD1306 datasheet
// Bit number used to represent command and parameter
#define SCREEN_WIDTH           128  // OLED display width, in pixels
#define SCREEN_HEIGHT          64  // OLED display height, in pixels
#define LCD_H_RES              SCREEN_WIDTH
#define LCD_V_RES              SCREEN_HEIGHT
#define I2C_HW_ADDR            0x3C
#define LCD_PIXEL_CLOCK_HZ     (400 * 1000)
#define LCD_CMD_BITS           8
#define LCD_PARAM_BITS         8
#define PIN_NUM_RST            -1
// Pin may vary based on your schematic
#define SDA_PIN GPIO_NUM_21
#define SCL_PIN GPIO_NUM_22

#include "Wire.h"
#include "HardwareI2C.h"
#include "hal/lv_hal_disp.h"
#include "core/lv_obj.h"

void setup()
{
  Serial.begin(115200);
  Wire.begin();
  ESP_LOGI(TAG, "Initialize I2C bus");
  Serial.println("Initialize I2C bus");
  i2c_master_bus_handle_t i2c_bus = nullptr;
  i2c_master_bus_config_t bus_config = {
      .i2c_port = I2C_STATUS_READ,
      .sda_io_num = SDA_PIN,
      .scl_io_num = SCL_PIN,
      .clk_source = I2C_CLK_SRC_DEFAULT,
      .glitch_ignore_cnt = 7,
      .intr_priority = 0,
      .trans_queue_depth = 0,
      .flags = {
          .enable_internal_pullup = true,
      }
  };
  ESP_ERROR_CHECK(i2c_new_master_bus(&bus_config, &i2c_bus));

  ESP_LOGI(TAG, "Install panel IO");
  Serial.println("Install panel IO");
  esp_lcd_panel_io_handle_t io_handle = nullptr;
  esp_lcd_panel_io_i2c_config_t io_config = {
      .dev_addr = I2C_HW_ADDR,
      .control_phase_bytes = 1,
      .dc_bit_offset = 6,
      .lcd_cmd_bits = LCD_CMD_BITS,
      .lcd_param_bits = LCD_PARAM_BITS,
      .scl_speed_hz = LCD_PIXEL_CLOCK_HZ,
  };
  ESP_LOGI(TAG, "Install SSD1306 panel driver");
  ESP_ERROR_CHECK(esp_lcd_new_panel_io_i2c(i2c_bus, &io_config, &io_handle));

  esp_lcd_panel_handle_t panel_handle = nullptr;
  esp_lcd_panel_dev_config_t panel_config = {
      .reset_gpio_num = PIN_NUM_RST,
      .bits_per_pixel = 1,
  };

  esp_lcd_panel_ssd1306_config_t ssd1306_config = {
      .height = LCD_V_RES,
  };
  panel_config.vendor_config = &ssd1306_config;
  ESP_LOGI(TAG, "Install SSD1306 panel driver");
  Serial.println("Install SSD1306 panel driver");
  ESP_ERROR_CHECK(
      esp_lcd_new_panel_ssd1306(io_handle, &panel_config, &panel_handle));

  ESP_LOGI(TAG, "Initialize LVGL");
  Serial.println("Initialize LVGL");
  const lvgl_port_cfg_t lvgl_cfg = ESP_LVGL_PORT_INIT_CONFIG();
  lvgl_port_init(&lvgl_cfg);

  const lvgl_port_display_cfg_t disp_cfg = {
      .io_handle = io_handle,
      .panel_handle = panel_handle,
      .buffer_size = LCD_H_RES * LCD_V_RES,
      .double_buffer = true,
      .hres = LCD_H_RES,
      .vres = LCD_V_RES,
      .monochrome = true,
      .rotation = {
          .swap_xy = false,
          .mirror_x = false,
          .mirror_y = false,
      },
      .flags = {
          .sw_rotate = false,
      }
  };
  lv_disp_t *disp = lvgl_port_add_disp(&disp_cfg);

  ESP_LOGI(TAG, "Display Scroll Text");
  Serial.println("Display Scroll Text");
  // Lock the mutex due to the LVGL APIs are not thread-safe
  if (lvgl_port_lock(0)) {
    Serial.println("Display Scroll Text mutex aquired");
    /* Rotation of the screen */
    lv_disp_set_rotation(disp, LV_DISP_ROT_NONE);

    //
    // TODO: Set text here
    lv_obj_t *scr = lv_disp_get_scr_act(disp);
    lv_obj_t *label = lv_label_create(scr);
    // Circular scroll
    lv_label_set_long_mode(label, LV_LABEL_LONG_SCROLL_CIRCULAR);
    lv_label_set_text(label, "Hello world!");
    // Size of the screen
    // If you use rotation 90 or 270, please set disp->driver->ver_res
    lv_obj_set_width(label, lv_disp_get_physical_hor_res(disp));
    lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 0);

    // Release the mutex
    lvgl_port_unlock();
  }
}

void loop()
{
}